Emperor Insanity

If an assassin died would they leave behind anyone who truly cared for them? Mercury, a notorious assassin, found the answer to this question as he bled to death in a dumpster leaving behind no one. Not a Lover, Family Member, or Friend As Mercury died he wished for happiness in his next life as his current one was nothing short of unfavorable. Little did he know that he would be reincarnated into a world much like the last but there was a slight catch. Mana, Qi, and Ki exist Will the former assassin reform and try to become the hero or will he be pushed to become the villain again?